按照官方文档：

public void CreateOrder() throws Exception{

//请求URL

HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/h5");

// 请求body参数

String reqdata = "{"

+ "\"amount\": {"

+ "\"total\": 100,"

+ "\"currency\": \"CNY\""

+ "},"

+ "\"scene_info\": {"

+ "\"payer_client_ip\":\"14.23.150.211\","

+ "\"h5_info\": {"

+ "\"type\": \"IOS\"" + "}},"

+ "\"mchid\": \"1900006891\","

+ "\"description\": \"Image形象店-深圳腾大-QQ公仔\","

+ "\"notify_url\": \"https://www.weixin.qq.com/wxpay/pay.php\","

+ "\"out_trade_no\": \"1217752501201407033233388881\","

+ "\"goods_tag\": \"WXG\","

+ "\"appid\": \"wxdace645e0bc2c424\"" + "}";

StringEntity entity = new StringEntity(reqdata);

entity.setContentType("application/json");

httpPost.setEntity(entity);

httpPost.setHeader("Accept", "application/json");

//完成签名并执行请求

CloseableHttpResponse response = httpClient.execute(httpPost);

try {

int statusCode = response.getStatusLine().getStatusCode();

if (statusCode == 200) {

System.out.println("success,return body = " + EntityUtils.toString(response.getEntity()));

} else if (statusCode == 204) {

System.out.println("success");

} else {

System.out.println("failed,resp code = " + statusCode+ ",return body = " + EntityUtils.toString(response.getEntity()));

throw new IOException("request failed");

}

} finally {

response.close();

}

}

成功返回

success,return body = {"h5_url":"https://wx.tenpay.com/cgi-bin/mmpayweb-bin/checkmweb?prepay_id=wx282017151348384a8e06cf8500b9ab0000&package=3420926560"}

通过h5_url拉起微信支付客户端开始支付，而支付的时候等待一段时间后显示系统繁忙，请稍后再试！请问管理员这是什么错误呢？已经是你们最新官网开放文档来的，不是XML了。